Improved machine for threading  bolts



N. THOMAS.

Bolt Cutter.

No. 99,259. Patented Jan. 25, 1870.

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d'ltitrd (States aient (fettina Letters Patent No. 99,259, dated January 25, 1870.

IMPRVEDMACHINE FOR THREADING BOLTS.

The Schedule referred to in these Letters Patent and making part of the same I, NICHOLASATIIOMAS, of Chicago, in the county of Cook, and State of Illinois, have invented certain Improvements in Bolt-Cutters, of which the following is a specification.-

My invention relates to a machine for cutting screwthreads upon bolts, whereby a thread is cut by revolving dies or cutters, radiating from the bolt, and adjustable, at the will ofthe operator, by means of mechanism which will be hereatter more fully described.; and also to a device whereby the cutting-dies are thrown clear of the bolt autoinaticall y, at the instant a suincieut length of thread is cut. which will be more particularly `shown hereinafter.

Description of the Accompanying Drawings.

Figure 1 is a side elevation, with one of ,the standards cut away, to show the trcadle and connected 1evers. l

Figure 2 is a front elevation.

Figure 3 is a view of the dies and their position, the face-plate being removed.

Figure 4 is a `section across n: a: of fig. 3, the faceplate being replaced.

Figure 5 is a rear view of the collar and movable sleeve.

General Description.

Y is the front, and Z, the rear ofthe machine.

A are standards, bea-ring the hollow shaft B.-

D is a disk, carried at the end ofthe shaft B. This disk is provided with slots in its front face, extending from its outer circumference to the circular opening at its centre.` These slots are cut with one edge upon the line of a radius of the disk, and the other parallel to it.

Working in the slots are the dies E, with their cutting-edge at the cent-ral opening of the disk.

These dies are provided, at their outer ends, with an inclined hook or projection, e, which is clearly shown at iig. 4.

F is a collar, surrounding the shaft B.

Upon the rear f'ace of this collar, a recess, j`,.is cut, into which ts the block or stop b. This block or stop fits also into a groove running around the shaft, marked g.

A set-screw, h, passes through the collar, and presses upon the block or stop, securing the collar in its place. This block or stop takes a large portion of the strain from the set-screw, and alfords it a firm hold.

Projecting from the front face of the collar are the guides G, upon which slides the movable sleeve H.

This sleeve carries upon its front the two concentric rings I and 1'. ,The aperture between these rings is constructed to form a series of eccentrics or camsone for each die.

These eccentries, tending from the circumference to the centre, serve two distinct purposes:

First, the adjustment of the dies to any-sized bolt, which is accomplished as follows: The hooks or projections e of the dies fit into these apertures between the rings, and, as the sleeve, with these concentric rings, is turned upon the shaft, the cutting-edges of the dies are moved from or toward the centre. When the proper adjustment is reached, the sleeve is fixed iirmly by the set-screw above described.

Second, the closing and opening of the dies, yto enable thcm to engage and disengage with the bolt. This I accomplish as follows: The movable sleeve slides bac-k and forth upon the shaft. The inner ring I' is bevelled, so that, when moved back by the motion of the sleeve, it presses against the inner incline of the projection e, and thereby withdraws the die from the centre, and disengages it from the bolt.' The outer ring I, when the sleeve is moved forward, presses against the outer incline of the hook or projection e,

and moves the die toward the centre, ready to engage with the bolt. The movable sleeve is provided with a groove, in which is the yoke M. To this yoke is attached the forked bell-crank lever l, having its fulcruin at O. The other end of this bell-crank lever is jointed to the upright rod r, which connects with the treadle T. Now, the downward motion of the operators foot upon the treadle is carried, by the rod and bell-crank level', to the yoke and sleeve, and is ,converted into a horizontal motion ofthe saidsleeve, so that, by pressing the treadle down, the sleeve is moved forward upon the shaft B unt-il it comes against the face-plate K, which said face-plate is screwed on the front of the disk D, and serves t0 keep the dies in their slots.

The rod lr is provided with a spiral spring, yS, which tends to press it down', and thereby to throw the sleeve back, and the treadle up.

dis a' dog or catch, to which is attached the horizontal rod N.

This rod is furnished with a spring, S', which tends to press it forward.

' Upon this horizoutalvrod is placed the adjustable arm p, furnished with a set-screw.

The rod N may be of any length desired.

When the upright rod /r is raised by the treadle, the dog (l catches under the end of'the bell-crank lever l, and holds it in that position, whereby the sleeve is firmly held against the face-plate. The, dies are thus pushed toward the centre by the forward motion of the sleeve, ready to engage with the bolt, which is now placed in the proper position, and held by a suitable contrivance. The said bolt is engaged with by the dies, and is carried back, as it is being cut, until a suicient length -ot' thread is formed, when the arm p,

which has been previously adjusted, is struck by the eontrivance which holds the holt, and the rod N thereby pressed hack, which loosens the dog d ii'oin the bell-crank lever. ".ihe spring S then asserts itself, and throws hack the sleeve, which backward motion of the sleeve withdraws and disengages the' dies, in the inanner above shown. he cut holt is withdrawn from the hollow shaft I5, and the machine is ready for another holt.

The dies E have the outer ends square, for the purpose of affording firm bearing against the outer ring I, this square end being the upper termination of the outer incline of the hooked projection e. The inner incline of this hooked projection has also a square termination next to the body of' the die, to press against the inner ring I. The object of this peculiar construction is obvious. vVhen the dies engage with the holt, the tendency of the resistance offered is to throw the dies outward, and this outward mot-ion would tend to throw back the sleeve,were the incline oi' the hooked projection continuous to the top of the die; but the squarely-constrncted end of the die prevents this. v I do not limit myself to the above-described met-ho of moving the sleeve; but the operation of the spring S may be reversed, so as to press the sleeve forward instead of backward. By such an arrangement, the automatic dog or catch may he dispensed with', and the sleeve drawn back, and the dies disengaged, by pressing upon the treadle T, which, for that purpose, may

be arranged as a lever of the second class, instead of the first class, as shown in the drawings.

Claims.

I claim, as my inventionl. The combination of the sleeve H, provided with the concentric rings I I', having the outside edge of the inner ring I bevelied, and having the inside edge of vthe outer ring I rst bevelled slightly at the face, and then square, and having the aperture between the said rings I I' constructed to forni a series of eccentrcs, with dies, having-inclined hooks, constructed with a square top, as a bearing against the square part of ring I, and a plain or square bearing at the juncture ofthe hook to the die on the-under side thereof', to rest on the edge of the ring I', substantially as and for the purpose specified.

2. The combination of the dies, with inclined projections, rings I I, sleeve H, collar F, pins G', and set-screw h, with the shaft B, substantially as described.

3. The dog or catch (l, in combination with the spring S', the rod N, and the adjustable arm p, constructed andoperating substantially as and for the purpose specified.

NICHOLAS THOMAS r Vitnesses:

LEWIS L; COBURN,

J. W. MUNDAY. 

